/ Dictionary / Index H hematoma: Meaning and Definition of Find definitions for: he•ma•to•ma Pronunciation: (hē"ma-tō'mu, hem"u-), [key] — pl. -mas, -ma•ta a circumscribed collection of blood, usually clotted, in a tissue or organ, caused by a break in a blood vessel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hematoma (Thesaurus) hematolysis hematophagous Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language